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author | Eric Dumazet <edumazet@google.com> | 2015-03-16 21:06:20 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2015-03-17 15:18:00 -0400 |
commit | 7970ddc8f9ffe149b392975da60739ccd1796dea (patch) | |
tree | 9c5c365b44d7e6f4e7701d8235402b914ce25b79 /include/net/tcp.h | |
parent | 1bfc4438a7ef99e8a6cba0bd3a86249430256621 (diff) | |
download | op-kernel-dev-7970ddc8f9ffe149b392975da60739ccd1796dea.zip op-kernel-dev-7970ddc8f9ffe149b392975da60739ccd1796dea.tar.gz |
tcp: uninline tcp_oow_rate_limited()
tcp_oow_rate_limited() is hardly used in fast path, there is
no point inlining it.
Signed-of-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tcp.h')
-rw-r--r-- | include/net/tcp.h | 32 |
1 files changed, 2 insertions, 30 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 9fe1d53..5b29835 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -1216,36 +1216,8 @@ static inline bool tcp_paws_reject(const struct tcp_options_received *rx_opt, return true; } -/* Return true if we're currently rate-limiting out-of-window ACKs and - * thus shouldn't send a dupack right now. We rate-limit dupacks in - * response to out-of-window SYNs or ACKs to mitigate ACK loops or DoS - * attacks that send repeated SYNs or ACKs for the same connection. To - * do this, we do not send a duplicate SYNACK or ACK if the remote - * endpoint is sending out-of-window SYNs or pure ACKs at a high rate. - */ -static inline bool tcp_oow_rate_limited(struct net *net, - const struct sk_buff *skb, - int mib_idx, u32 *last_oow_ack_time) -{ - /* Data packets without SYNs are not likely part of an ACK loop. */ - if ((TCP_SKB_CB(skb)->seq != TCP_SKB_CB(skb)->end_seq) && - !tcp_hdr(skb)->syn) - goto not_rate_limited; - - if (*last_oow_ack_time) { - s32 elapsed = (s32)(tcp_time_stamp - *last_oow_ack_time); - - if (0 <= elapsed && elapsed < sysctl_tcp_invalid_ratelimit) { - NET_INC_STATS_BH(net, mib_idx); - return true; /* rate-limited: don't send yet! */ - } - } - - *last_oow_ack_time = tcp_time_stamp; - -not_rate_limited: - return false; /* not rate-limited: go ahead, send dupack now! */ -} +bool tcp_oow_rate_limited(struct net *net, const struct sk_buff *skb, + int mib_idx, u32 *last_oow_ack_time); static inline void tcp_mib_init(struct net *net) { |